Optical fibre hydrophone

Details Optical fibre hydrophone Optical fibre hydrophone

G - Physics

01

H

349/24

G01H 9/00 (2006.01) G02F 1/03 (2006.01)

Patent

CA 1223954

28 ABSTRACT OF THE DISCLOSURE The invention relates to a monomodal optical fibre hydrophone operating by elastooptical effect, which has an inter- ferometer structure comprising a measuring arm, in which is arranged a very long monomodal optical fibre immersed in the interaction medium in which propagates the soundwave. A phase displacement is induced by an elastoopti- cal effect on the soundwave propagating in the fibre, by a soundwave producing an acoustic pressure field in said medium. A reference arm establishes a reference optical path and the phase displacement, linked with the sound wave, is detected by interferometry between the two optical waves coming from these two arms. This two-armed interferometer is terminated by a photorefractive medium used as an interactive reflector in accordance with the four-wave interferometry principle.

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